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Cash and cash equivalents and short-term deposit (Details) - Schedule of cash and cash equivalents and short-term deposit - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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US$ equivalent [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | $ 15,118 | $ 8,064
US$ [Member] | Original currency [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 6,276 | 3,195
US$ [Member] | US$ equivalent [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 6,276 | 3,195
RMB [Member] | Original currency [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 27,129 | 13,433
RMB [Member] | US$ equivalent [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 3,895 | 2,107
JPY [Member] | Original currency [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 448,139 | 158,479
JPY [Member] | US$ equivalent [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 3,370 | 1,192
HKD [Member] | Original currency [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 5,411 | 5,791
HKD [Member] | US$ equivalent [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | 695 | 743
Others [Member] | US$ equivalent [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash on hand and cash held at bank balance and short-term deposit | $ 882 | $ 827

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(9)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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